OK I am interested from my experiences if anyone has a theory or facts as why:
JCI uses 3 wire for FC Bus (MSTP).
And Allerton and Delta use 2 wires for the MSTP trunk.
Before you ask I have only worked on Delta, Allerton and JCI.
Is there some internal grounding going on in 2 wire boxes and JCI uses 3 , well actually 4 if you include the shield,to ground between controllers.
Does JCI use 3 because thats is the standard for N2, and they just kept it that way?
I am looking for professional opions, thoughts, experiences, solutions and not another manufacturer bashing thread.
Thank you in advance for your cander and professionalism.